diff --git a/eikonalGPU/src/eikonal.cpp b/eikonalGPU/src/eikonal.cpp
index f089a2e..e8d9d30 100644
--- a/eikonalGPU/src/eikonal.cpp
+++ b/eikonalGPU/src/eikonal.cpp
@@ -10,7 +10,7 @@
 // #define timeMeasure 1
 // #define verbose 1
 
-double* eikonal(double* volume,int* dims,double* startpoint) {
+double* eikonal(double* volume,int* dims,double* startpoint,int gpuSelection) {
 
     // for time measurement
     #ifdef timeMeasure
@@ -21,7 +21,7 @@ double* eikonal(double* volume,int* dims,double* startpoint) {
     // default parameters for number of threads and iters per block
     size_t itersPerBlock = 10;
     int nthreads=8;
-    int gpuSelection;
+    
     bool structuredEikonalVerbose = false;
     #ifdef verbose
         structuredEikonalVerbose = true;
diff --git a/eikonalGPU/src/eikonal.h b/eikonalGPU/src/eikonal.h
index 124a5eb..1897fa8 100644
--- a/eikonalGPU/src/eikonal.h
+++ b/eikonalGPU/src/eikonal.h
@@ -1 +1,10 @@
-extern double* eikonal(double* volume,int* dims,double* startpoint);
\ No newline at end of file
+/**
+ * @brief 
+ * 
+ * @param volume volume data
+ * @param dims volume dims array
+ * @param startpoint  start point data
+ * @param gpuSelection 
+ * @return double* 
+ */
+extern double* eikonal(double* volume,int* dims,double* startpoint,int gpuSelection);
\ No newline at end of file